3Com Access Builder 7000 User Manual page 22

1-6 C 1: B /R M
HAPTER RIDGE OUTER ODULE
When no data is being passed between the workstation and server, the
Bridge/Router Module closes the ISDN connection and the units at
each end of the link spoof the Novell IPX protocol so that both the
workstation and server believe the connection is still valid. As soon as
the unit identifies that data needs to be passed to the server, the ISDN
connection is re-established without the user being aware of ever
being disconnected. In this way ISDN calls are kept to a minimum.
Figure 1-1 Connecting To A Remote Novell Network
In the example shown in Figure 1-1, the Main Site is connected to a
Remote Site. The Main Site provides many network facilities required by
remote users. The Remote Site shown has several workstations and a
server but could equally consist solely of workstations or even a single
workstation (such as in the case of a homeworker) but could be a similar
sized site to the Main Site.
If you are connecting to the remote site over a WAN leased line link, the
Bridge/Router Module has no need to spoof the IPX protocol as there is a
permanent connection in place. Once the unit has determined that the
server is on the Remote Site all data between the server and workstation
is passed over the link.